Cooking apparatus

ABSTRACT

A cooking apparatus is disclosed herein having a pair of coaxial telescoping sleeves formed with a plurality of slits or openings adapted to be in or out of registry by sliding the sleeves relative to one another. The inner sleeve of the pair includes a platform midway between its opposite ends for defining a heating chamber on one side and a food container chamber on the other side thereof. An adjustable securement mechanism is carried on one end of the outer sleeve which is responsive to expansion of the heated container for extinguishing ignited fuel in the heating chamber terminating the cooking procedure.

[451 Apr. 10, 1973 United States Patent [191 Stansell i 1 COOKINGAPPARATUS [76] Inventor:

Rex L. SI u l w Lexington Primary Examiner-William F. ODea Drive,Glendale Calif 91203 Assistant ExammerPeter D. Ferguson Attorney-RogerA. Marrs May 3, 1971 [22] Filed:

[57] ABSTRACT A cooking apparatus is disclosed herein having a pair ofcoaxial telescoping sleeves formed with a 211 Appl. No.: 139,504

plurality f registry [52] US. ...l26/262, 126/43 [51] of slits oropenings adapted to be in or out 0 g by sliding the sleeves relative toone another. The

[58] Field of Seal-chum......... ....126/262, 265, 266,

126/43, 374 inner sleeve of the pair includes a platform midway betweenits opposite ends for defining a heatin 56] References Cited chamber onone side and a food container chamber 0 the other side thereof. Anadjustable securement UNITED STATES PATENTS mechanism is carried on oneend of the outer sleeve which is responsive to expansion of the heatedcontainer for extinguishing ignited fuel in the heatin chamberterminating the cooking procedure.

2,502,434 4/1950 Creitz...............................126/262X FOREIGNPATENTS OR APPLICATIONS 3/1924 GreatBritain.......

1 1 Claims, 8 Drawing Figures PATEF ITED APR 1 0 75 SHEET 2 [1F 2 O TO RX A. $74A/6ELL INVENTOR.

COOKING APPARATUS BACKGROUND OF THE INVENTION from the can for heatingand consuming purposes. In 1 some instances, the food may be heated insitu by introducing the can to a burning fuel. The food heats rapidlyunder this condition since any air, water, steam, gas or the like isconfined and pressure cannot be relieved. Close observation must bemaintained as otherwise pressure build-up will rupture the walls of thecan freeing the enclosed food. In fact, an explosion generally occurswhich scatters hot food in all directions. Obviously, this is adangerous circumstance and one to be avoided.

More recently, stoves have been incorporated directly into the storagecontainer for the food. Such primary examples reside in U. S. LettersPat. No. 249,769; 2,575,299 and 3,369,538. These devices also sufferfrom inadvertent over-heating resulting in explosion unless closelywatched. Furthermore, the stoves employ a confined food can or containerholding area which is not adaptable for holding cans of varying ordifferent sizes. The holding areas shown or defined by the prior art arenot capable of confining the effects of an explosion since the sidewall,top, bottom or portions thereof will easily separate or or disassembleand become flying projectiles or missles.

Therefore, a long standing need exists for a stove useful in heatingcanned food that will extinguish its own ignited fuel at a selectednatural temperature as opposed to a gage setting and which may bereadily transportable as a self-contained unit by sportsmen, boatmen,campers or the like.

SUMMARY OF THE INVENTION Accordingly, the difficulties and problemsencountered with conventional stoves and self-contained heatingapparatus are obviated by the present invention which provides a novelcooking apparatus having a pair of coaxially disposed telescopingsleeves arranged in sliding relationship and wherein each of the sleevesis formed with slots or openings capable of being aligned to conduct airinto the interior of the sleeves. The innermost sleeve of the pairincludes a transverse grid or grille for supporting the food can whichdivides the interior of the sleeve into a fuel-burning area and a foodheating area. The outermost sleeve carries an adjustable securementmechanism which senses any expansion of the can during heating andoperates in response to expansion by displacing the outer sleeverelative to the inner sleeve for closing the slots or opening. Theburning fuel is extinguished and no further increase in can pressure isexperienced.

In addition to automatic cessation of heating, the apparatusincorporates means for accommodating a plurality of different sized cansor containers. Also, a novel means is employed for locking or retainingthe sleeves in fixed axial alignment. Such means includes a bailpivotally carried through over-sized openings formed on opposite sidesof the sleeves and employing the cover or lid as a cam for spreading thebailinto its unlocked position.

Therefore, it is among the primary objects of the present invention toprovide a novel cooking apparatus having means for automaticallyextinguishing a burning fuel in response to an actual cooking pressure.

Another object of the present invention is to provide a novel shut-offmechanism for a portable stove which 0 senses expansion in the size of aclosed and sealed container and is responsive thereto for extinguishingan ignited and burning fuel.

Another object of the present invention is to provide a novel portablecooking device which is simple in construction, safe to use, andrelatively inexpensive to manufacture.

Still another object of the present invention is to provide a novelcooking stove for heating canned foods quickly and for shutting itselfoff automatically when food is hot.

A further object of the present invention is to provide a novel cookingstove having a means for heating canned food in situ, for sensing theexpansion of the can under pressure and for extinguishing the heatingmeans in response to the sensed pressure expansion of the can.

BRIEF DESCRIPTION OF THE DRAWINGS The features of the present inventionwhich are believed to be novel are set forth with particularity in theappended claims. The present invention, both as to its organization andmanner of operation, together with further objects and advantagesthereof, may best be understood by reference to the followingdescription, taken in connection with the accompanying drawings, inwhich:

FIG. 1 is an exploded perspective view of the novel cooking apparatus.of the present invention illustrating the component parts thereof priorto assembly for performing a cooking procedure;

FIG. 2 is an enlarged longitudinal cross-sectional view of the cookingapparatus shown in FIG. 1 illustrat ing the apparatus as being fullyassembled preparatory for cooking;

FIG. 3 is a fragmentary view of a novel retaining mechanism forreleasably interconnecting the inner and outer sleeves of the apparatusas taken in the direction of arrows 3-3 of FIG. 2;

FIG. 4 is a view similar to the view of FIG. 2 illustrating theapparatus at completion of a heating or cooking procedure;

FIG. 5 is a cross-sectional view of the cooking apparatus shown in FIG.4 as taken in the direction of arrows 5-5 thereof;

FIG. 6 is a transverse cross-sectional view of the cooking apparatus astaken in the direction of arrows 6-6 of FIG. 5;

FIG. 7 is a fragmentary view, in cross-section of the retainer mechanismillustrated in the direction of arrows 77 of FIG. 5; and

FIG. 8 is a transverse cross-sectional view of the cooking apparatusshown in FIG. 4 as taken in the direction of arrows 8-8 thereof.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, the novelcooking apparatus of the present invention is illustrated in the generaldirection of arrow which includes, in general, an inner sleeve 11coaxially disposed in telescoping sliding relationship with an outersleeve 12 so as to properly index and register a plurality of slots oropenings formed in each of the sleeves. An opening or slot in sleeve 1 1is identified by numeral 13 while a similar slot or opening isidentified by numeral 14 in sleeve 12. Inner sleeve 11 further includesa base portion 15 and a grid or grille 16 secured to the inside wallsurface of the sleeve midway between its opposite ends. The bore ofinner sleeve 1 1 is therefore divided into a pair of chambers consistingof a lower chamber for insertably receiving a canned fuel 17, such asalcohol or the like. When properly ignited, the heated fuel will risepast the grid or grille 16 into a food chamber occupied by aconventional food can or container 18. The food can rests upon the gridor grille 16 and is substantially coaxially disposed with respect to theinnermost cylinder or sleeve 11.

The outer sleeve 12 includes a top portion 20 that closes off one end ofthe sleeve while the opposite end of the sleeve is open so as tomaintain the sliding telescopic relationship with the inner sleeve 11.The top 20 supports an adjustment mechanism, illustrated in thedirection of arrow 21, which not only permits accommodation for avariety of different sized cans in the heating chamber but provides forthe automatic fuel shut-off feature which will be described later. Theouter sleeve 12 also includes a thermal blanket or covering 22 that maybe employed to protect the hands of the user during assembly ordisassembly.

As a means for aligning the slots 13 and 14 of the respective sleeves,index means are provided between the two sleeves. This means may readilyinclude a pointer 23 carried along the edge of the open end of outersleeve 12 and a marker 24 carried on the base 15 of the inner sleeve 11.Therefore, when the sleeves are slid together, the marker 23 may bealigned with the marker 24 whereby the respective slots or openings willproperly index and register. When the slots or openings are soregistered, the fuel chamber occupied by the fuel can 17 and the heatingchamber occupied by the food can 18 are in fluid communication with theambient environment. When the sleeves are arranged with respect to oneanother so that certain portions of the sleeve sidewalls block therespective openings or slots, the respective chambers are substantiallycut off or isolated from the surrounding environment.

The inner and outer sleeves 11 and 12, respectively, are provided with alock mechanism for holding the sleeves together which takes the form ofa substantially U-shaped bail 26 having opposing terminating ends whichpass through holes on opposite sides of the sleeves so as to preventsubstantial axial movement and substantial radial movement between thesleeves. This mechanism will be described in detail later. The bail 26also includes a cushioned handle 27 that extends between the respectivelegs of the U-shaped member.

Initially, the fuel can 17 is inserted into the fuel chamber beneath thegrid or grille 16 at one end of the inner sleeve 11. This is followed byinsertion of the food can 18 through the opposite end of the cylinder orsleeve 11 so that the bottom of the can rests on the grid or grille 16.Next, the outer sleeve 12 is slid over the end of the inner sleeve 11about its end opposite to the end carrying base 15. The outer sleeve isslid over the inner sleeve until the mechanism 21 engages with the topof the can 18 so as to press the can against its supporting grid orgrille 16. At this time, the bail 26 may be pivoted about its mountingon the cylinders to lock the sleeves together as a unit whereby onlyminimum axial movement will be permitted.

Referring now in detail to FIG. 2, it can be seen that the cookingapparatus of the present invention rests on top of the fuel can 17 whenin use. To provide adequate support, an annular bead 30 is provided onthe inside wall surface of the inner sleeve 11 which is adapted toengage with a lip formed in a conventional can. The bead 30 and the lipof the can 17 engage in an interference fit so that the can must bepressed over the bead to effect engagement. The upper surface of thefuel can 17 is in fixed spaced apart relationship with respect to theunderside of the platform, grille or grid 16. When in this location, itis to be noted that the plurality of slots or openings 14 form a lowerrow which are in registry with the slots 13 in the inner sleeve so thata suitable air flow ensues between the fuel can and the ambientenvironment. Air is drawn through the aligned or registered openings orslots so that the fuel will continue to burn.

It is also to be noted that an upper row of aligned or registered slotsor openings are formed about the heating chamber occupied by the foodcan 18. Such registered or aligned openings present a passageway forexhausting heat during the cooking procedure. The openings or slots inboth the upper and lower rows adjacent the heating chamber and the fuelburning chamber are characterized as being on an angular slant withrespect to the horizontal whereby the air passageway therethrough may bereadily adjusted by rotating or twisting the inner and outer sleeveswith respect to one another so that the terminating edges of the slotsor openings increase or decrease the passageways as desired.

It is also to be noted in FIG. 2 that the grid or grille 16 includes araised central portion, indicated by numeral 31, which engages thecentral bottom of the can 18. Normally, when first assembling the unitwith can 18 within the heating chamber, the can may not be supported inan upright manner on the central portion 31. However, when theadjustable mechanism 21 is tightened down, the can will right itself onthe central raised portion 31.

The adjustable mechanism 21 includes a screw 32 having its shank inthreadable relationship with a nut member 33 and having a pressuremember 34 carried on the extreme end of the shank. The pressure member34 occupies the upper portion of the heating chamber and when the screw32 is rotated by means of its knurled handle 35, the pressure member 34will extend into forcible engagement with the top of the can 18. Whensufficient finger pressure has been applied, the can 18 will be properlysupported on the grid or grille 16 under the pressure of the pressuremember 34. Inasmuch as the screw 32 can move through the top 20, cans ofvarying heights can be accommodated within the heating chamber. Cans ofvarying diameter may be accommodated up to the dimensional diameter ofthe inner sleeve 11.

FIG. 2 further illustrates that the bail 26 includes terminating ends 36and 37 which are pivotally carried through fittings 38 and 40 so thatthe extreme end of the terminating ends 36 and 37 are in alignment withholes 411 and 42 formed in the sidewall of outer sleeve 12. In thisapproximate location, the inner sleeve 11 is formed with a substantiallysquare opening 43 and 44 so that the opposing terminating ends 36 and 37of the bail may pass through the aligned openings 41, 43 and openings42, 44. This rectilinear movement of the terminating ends 36 and 37 intoand out of engagement with the holes and openings in the sleeves iseffected by divergingly directing the opposite legs of the bail 26 sothat their opposing surfaces strike or ride against the opposite edgemarginal region of the outer sleeve. These opposite regions areidentified by numerals 45 and 46 and the distance between the opposingsurfaces of the legs of the bail is lesser than the distance across thetop 20. Therefore, engagement between the legs of the bail and themarginal regions 45 and 46 operates as a cam whereby the resultanteffect is to spread the terminating ends 36 and 37 apart when engagementoccurs between the regions 45 and 46 and the legs of the bail. However,when the bail is rotated in a downward direction, the legs of the bailleave the areas 45 and 46 so that the normal and natural spring bias ofthe bail will urge the ends 36 and 37 through the aligned openings.Thus, the inner and outer sleeves are permitted only a limited amount offreedom axially or radially depending upon the engagement of the end ofthe bail with the edges of the inner sleeve that define the squareopenings. It is important to note that since the opposite ends of thebail are carried on the outer sleeve by means of fittings 38 and 40, anymovement of the sleeve in an up and down direction is reflected ortransferred into movement of the terminating ends 36 and 37 accordingly.

This pin or terminating end relationship is shown more clearly in FIG.3. It can be seen that the terminating end 36 may move vertically orhorizontally with respect to the axis of sleeve 12 and is restrictedonly by engagement with the sides of the sleeve defining the opening 43.

By raising the bail, as shown in FIG. 2 so that the diverging oppositelegs of the bail engage with the top 20, the bail terminating ends 36and 37 reside along the bottom of opening 43 adjacent one of the sidesas shown in FIG. 3. This may be determined as the carrier position forthe unit and the handle 27 may be readily grasped by the hand of theuser during transportation and for initial set-up for assembly purposes.However, when the device is being used for heating, the bail 26 ispivoted on its terminating end within fittings 38 and 40 so that thebail and its handle are in a lowered position, as shown in FIGS. 4 and5, whereby the normal resilient bias of the bail urges the terminatingends 36 and 37 through the aligned openings to loosely engage the outersleeve with the inner sleeve. As the burning of the fuel in can 17progresses, heat is transferred through the grille or plate 16 into theheating chamber for elevating the temperature of the food within can 18.It is the conventional practice to vacuum pack food in cans and whenheated, expansion occurs so that the lid of the can, as indicated bynumeral 50, will buckle, distort or otherwise become deformed due to theexpansion of gasses within the can. As the expansion of the lid 50occurs, pressure is exerted to the top or outer cylinder 12 via thepressure member 34 and the screw 32 so that the outer sleeve is slidupwardly over the inner sleeve 1 I. The upwardly sliding movement of theouter sleeve misaligns its openings or slots 14 with respect to theopenings or slots 13 on the lower or inner sleeve so that a blockageoccurs isolating both the heating chamber and the burning chamber fromexternal environment. This means that the burning of the fuel will beextinguished due to the removal of air from the burning chamber. Withrespect to the heating chamber, heat in the chamber will remain so as tomaintain the food in the can warm for many hours. Under normalcircumstances, it requires only three minutes to heat the food and shutoff the fuel while the food in the can will remain warm in the can forapproximately four hours.

When the force of the expanded can urges the outer sleeve upward, thebail and its terminating ends 36 and 37 will travel upward untilrestricted or stopped by engagement of the terminating ends with theupper edge of the inner sleeve sidewall defining the openings 43 and 44.However, the upward movement is sufficient to misalign slots or openings13 and 14 so that a closure of the upper and lower compartments orchambers is produced.

FIG. 6 more clearly illustrates the misalignment of the slots oropenings 13 and 14 and the placement of terminating end 36 against theupper edge of opening 43.

Referring now in detail to FIG. 7, it can be seen that slight rotary ortwisting of the sleeves 11 and 12 with respect to each other ispermitted. This again results because of the side edges of openings 43and 44. This movement of course permits the slots or holes 13 and 14to-be aligned for any intended closure or limited air passagetherethrough. Preferably, the ball 36 is mounted so that the fittings 40and 36 are centered approximately, apart on the sleeves. By so doing, an

even number of slots, such as six, for example, can be placed about theperiphery of the sleeves in each row.

Referring to FIGS. 6 and 7, it can be seen that by twisting the outercylinder or sleeve with respect to the inner sleeve, the cookingtemperature may be controlled since the slot openings may be reduced orincreased to restrict or control the flow of air therethrough. The angleof movement is illustrated between the arrows shown in FIG. 7 while FIG.6 illustrates the placement of fittings 33 and 40. Obviously, forcomplete air passage and control purposes, the surrounding blanket 22must also have slots or openings conforming to those in the outersleeve.

Referring now to FIG. 3, it can be seen that the grille or grid 16 issegmented so that a substantial passageway exists between the lowerburning chamber and the upper heating chamber. Also, the handle ispreferably curved so as to conform about the base 15 when folded to makethe unit compact.

Therefore, the present invention has features such as automatic shut-offand heat control for the temperature of the food by the adjustment ofthe air and exhaust slots 13 and 14. It will keep the food hot for aperiod up to four hours. Also, it is simple in construction compared tothe other devices shown in the aforementioned patents. The presentapparatus may heat four different sizes of canned food with anadjustment in the outer cylinder and operation of the secureinentmechanism 21. The automatic cooking apparatus will heat a sealed can ofunopened food, such as a can of Pork and Beans to eating temperature inapproximately 3 minutes and will automatically shut off in 5 minuteswithout any chance of the can exploding, due to the fact that it doesshut off automatically. With the bail 26 in the side or down position,the two cylinders cannot be separated from each other even though thefood can were to explode.

While particular embodiments of the present invention have been shownand described, it will be obvious to those skilled in the art thatchanges and modifications may be made without departing from thisinvention in its broader aspects and, therefore, the aim in the appendedclaims is to cover all such changes and modifications as fall within thetrue spirit and scope of this invention.

What is claimed is: l. A cooking apparatus comprising the combination: asealed container confining contents to be heated; a pair of elongated,hollow members arranged in movable relationship with respect to eachother; means carried by said members cooperating with each other forventing the interior of said members; and means intercoupling saidsealed container and a selected one of said members responsive toexpansion of said sealed container for moving said selected one of saidmembers to close said venting means. 2. The invention as defined inclaim 1 including a heating chamber and a fuel burning chamber; meanscarired by one of said members for supporting said sealed containerwithin said heating chamber; and means disposed within said fuel burningchamber for maintaining combusion to heat said heating chamber when saidmembers are disposed so as to open said venting means. 3. The inventionas defined in claim 2 wherein said members comprise coaxially disposedand telescoping cylindrical sleeves; and said venting means includes aplurality of openings formed in said sleeves and arranged in a first rowabout said fuel burning chamber. 4. The invention as defined in claim 3wherein said venting further includes a second row of said plurality ofopenings arranged about said heating chamber.

5. The invention as defined in claim 4 wherein said openings in saidfirst and second rows are air passageways to the interior of saidsleeves when said openings in said respective sleeves are in registryprior to expansion of said sealed container; and

said openings being out-of-registry to block said air passageways whensaid sealed container expands.

6. The invention as defined in claim 1 wherein a selected one of saidmembers includes a grid for supporting said sealed container securedacross the interior thereof substantially midway between its oppositeends so as to divide said interior into a fuel burning chamber and aheating chamber;

said intercoupling means comprising an axially adjustable screw bearingagainst a closed end of said selected member and against the top of saidsealed container.

7. The invention as defined in claim 1 wherein said intercoupling meanscomprises an axial adjustable member releasably engageable between saidsealed container and said selected member whereby said adjustable membersenses expansion of said sealed container and reacts in response toexpansion by closing said venting means.

8. The invention as defined in claim 1 wherein said pair of memberscomprise telescoping cylindrical sleeves arranged in slidingrelationship;

said venting means comprising a plurality of openings in each of saidsleeves, said openings being registered when corresponding openings ineach sleeve are aligned to permit the passage of air therethrough.

9. The invention as defined in claim 8 including means for retainingsaid sleeves in substantially fixed relationship permitting limitedrotary and axial displacement.

10. The invention as defined in claim 9 wherein said retaining meanscomprises a bail of U-shaped configuration having opposing separatedterminating ends pivotally carried on opposite sides of said outersleeve in said telescoping relationship;

said other sleeve from said outer sleeve having an opening formedtherein for selectively receiving said terminating ends to hold saidsleeves together.

11. The invention as defined in claim 10 wherein said bail cams againstsaid sleeve to forcibly spread said terminating ends to release saidsleeves from each other.

1. A cooking apparatus comprising the combination: a sealed containerconfining contents to be heated; a pair of elongated, hollow membersarranged in movable relationship with respect to each other; meanscarried by said members cooperating with each other for venting theinterior of said members; and means intercoupling said sealed containerand a selected one of said members responsive to expansion of saidsealed container for moving said selected one of said members to closesaid venting means.
 2. The invention as defined in claim 1 including aheating chamber and a fuel burning chamber; means carired by one of saidmembers for supporting said sealed container within said heatingchamber; and means disposed within said fuel burning chamber formaintaining combusion to heat said heating chamber when said members aredisposed so as to open said venting means.
 2. The invention as definedin claim 1 including a heating chamber and a fuel burning chamber; meanscarired by one of said members for supporting said sealed containerwithin said heating chamber; and means disposed within said fuel burningchamber for maintaining combustion to heat said heating chamber whensaid members are disposed so as to open said venting means.
 3. Theinvention as defined in claim 2 wherein said members comprise coaxiallydisposed and telescoping cylindrical sleeves; and said venting meansincludes a plurality of openings formed in said sleeves and arranged ina first row about said fuel burning chamber.
 3. The invention as definedin claim 2 wherein said members comprise coaxially disposed andtelescoping cylindrical sleeves; and said venting means includes aplurality of openings formed in said sleeves and arranged in a first rowabout said fuel burning chamber.
 4. The invention as defined in claim 3wherein said venting further includes a second row of said plurality ofopenings arranged about said heating chamber.
 4. The invention asdefined in claim 3 wherein said venting further includes a second row ofsaid plurality of openings arranged about said heating chamber.
 5. Theinvention as defined in claim 4 wherein said openings in said first andsecond rows are air passageways to the interior of said sleeves whensaid openings in said respective sleeves are in registry prior toexpansion of said sealed container; and said openings beingout-of-registry to block said air passageways when said sealed containerexpands.
 5. The invention as defined in claim 4 wherein said openings insaid first and second rows are air passageways to the interior of saidsleeves when said openings in said respective sleeves are in registryprior to expansion of said sealed container; and said openings beingout-of-registry to block said air passageways when said sealed containerexpands.
 6. The invention as defined in claim 1 wherein a selected oneof said members includes a grid for supporting said sealed containersecured across the interior thereof substantially disway between itsopposite ends so as to divide said interior into a fuel burning chamberand a heating chamber; said intercoupling means comprising an axiallyadjustable screw bearing against a closed en of said selected member andagainst the top of said sealed container.
 6. The invention as defined inclaim 1 wherein a selected one of said members includes a grid forsupporting said sealed container secured across the interior thereofsubstantially midway between its opposite ends so as to divide saidinterior into a fuel burning chamber and a heating chamber; saidintercoupling means comprising an axially adjustable screw bearingagainst a closed end of said selected member and against the top of saidsealed coNtainer.
 7. The invention as defined in claim 1 wherein saidintercoupling means comprises an axial adjustable member releasablyengageable between said sealed container and said selected memberwhereby said adjustable member senses expansion of said sealed containerand reacts in response to expansion by closing said venting means. 7.The invention as defined in claim 1 wherein said intercoupling meanscomprises an axial adjustable member releasably engageable between saidsealed container and said selected member whereby said adjustable membersenses expansion of said sealed container and reacts in response toexpansion by closing said venting means.
 8. The Invention as defined inclaim 1 wherein said pair of members comprise telescoping cylindricalsleeves arranged in sliding relationship; said venting means comprisinga plurality of openings in each of said sleeves, said openings beingregistered when corresponding openings in each sleeve are aligned topermit the passage of air therethrough
 8. The invention as defined inclaim 1 wherein said pair of members comprise telescoping cylindricalsleeves arranged in sliding relationship; said venting means comprisinga plurality of openings in each of said sleeves, said openings beingregistered when corresponding openings in each sleeve are aligned topermit the passage of air therethrough.
 9. The invention as defined inclaim 8 including means for retaining said sleeves in substantiallyfixed relationship permitting limited rotary and axial displacement. 9.The invention as defined in claim 8 including means for retaining saidsleeves in substantially fixed relationship permitting limited rotaryand axial displacement.
 10. The invention as defined in claim 9 whereinsaid retaining means comprises a bail of U-shaped configuration havingopposing separated terminating ends pivotally carried on opposite sidesof said outer sleeve in said telescoping relationship; said other sleevefrom said outer sleeve having an opening formed therein for selectivelyreceiving said terminating ends to hold said sleeves together.
 10. Theinvention as defined in claim 9 wherein said retaining means comprises abail of U-shaped configuration having opposing separated terminatingends pivotally carried on opposite sides of said outer sleeve in saidtelescoping relationship; said other sleeve from said outer sleevehaving an opening formed therein for selectively receiving saidterminating ends to hold said sleeves together.
 11. The invention asdefined in claim 10 wherein said bail cams against said sleeve toforcibly spread said terminating ends to release said sleeves from eachother. What is claimed is:
 11. The invention as defined in claim 10wherein said bail cams against said sleeve to forcibly spread saidterminating ends to release said sleeves from each other.